When sending an email in Google, the "CC" field stands for carbon copy, and "BCC" stands for blind carbon copy, meaning that the recipients are "blind" to the other email addresses.

You do not need to enter an email in the "To" or "CC" fields. When your message arrives, your recipients will be able to see that the email was sent to their inbox, in addition to "undisclosed recipients." They will not be able to view the other email addresses, nor will they be able to "reply all."